Sparking plug



-Qaeiree LUDOMR KORCZYNSKI, CRCOW, POLAND.

aereas i',

sraiaiaiiie PLUG..

application aiefii'uiy ia, i922. semina. ermee. i

To all whom t ma concern: Y

Be itknown that LUDOMIR KonczYNsKi,

a citizen of Poland, residing at Cracow,

Poland, have invented certain new and useful .improvements in Sparkin-gRugs, of

which the following is a specification.

My invention has reference to sparking lugs for the ignition of the gasmixture in explosion engines or internal combusl is the drawback of thesometimes very objectionable manner of securing the spar-,ker to theinsulating body, the difficulty of cleaning the parts an-dtheviinpossibility of adjusting the relative distance of the electrodeswhich facilitates the cranking of( the motor.,

A spark plug embodying the feature of iny invention, is shown by wayof'example upon the accompanying drawing in longitudinal lsectionalyiew.

r1`he outer fitting 2 of ordinary size is provided at its upper portionwith the usual six-cornered nut portion 2a for the engagement of awrench or the like, and at its lower portion it is provided with thethreaded portion 2b adapted to be threadedly fitted in the wall of themotor cylinder, and provided at its bottom with the two pr jections 2between which the electrode 9 is secured, the middle portion 9** ofwhich may, for instance, be of globular shape.

The interior insulation of the sparking plug is provided for' by twosocket. pieces 8 and 15 of porcelain or the like which are secured inthe fitting 2 by the threaded annulus 1. At the points of pressure theusual washers 3, 4i, 5 and 6 of mica, asbestos or the like are provided.In the interior of the socket 15 an interiorly threaded tube 12 issecured by means of a nut 13, a flange 12a being provided at the lowerend of the tube 12. By the tightening of the threaded annuluslthesockets of porcelain or the like are only submitted to ressurcstrain, but at the exclusion of s caring stress so that there is nodanger of bursting of said sockets. The current is admitted in the usualmanner, by means of a cable which is screw-threadedly secured betweenthe nuts 13 and 14.

in the interior of the tube 12 another tube 11 is threadedly secured,atl of which thereJ is a notch 11, driver, and is otherwise somewhatfunnelshaped in order to facilitate the pouring in of benzene and thelike, if desire-d. The lowerportion of the said tube serves as a guidefor the stem 10e of a movable valve electrode 10, the lower end of thetube serving as a valve seat. rlhe electrode 10, the stem 10e of whichis of four cornered cross section, in order to provide for the passageof air, is provided with a small reduced portion 10d, and below thispart there is the semi-globular valve body proper 10, and the plateshaped enlargement 10".y The lower end 10a of substantially hyperboloidyshape constitutes t-he second electrode.

The mode of operation of the device is as follows: At the beginning ofthe compression stroke the interior pressure causes the lvalve electrode10 to bevraised, and the semiglobular Valve body 10 to be forced uponits seat. At the same time the waste gases are forced into the space 7in the interior of the lower part'of'the sparker and between thesemi-globular part 10, and the plate 10b, so that the fresh gas mixtureis not thereby interfered with. After the pasthe top for the screwsageof the igniting spark the valve electrode 10 remains in the raisedposition during the explosion and the exhaust stroke. At the beginning'of the suction stroke the movable electrode drops down by the action ofthe atmospheric outer pressure, and

"thereby strikes against the contact ball 9,

so that by this means the two electrodes are cleaned from any combustionresidues. A t 'the same time the gases compressed in the chamber 7 andsubsequently thereof the cooling fresh air passes with great velocitythrough the narrow annular slot between the outer edge of the plate 10band the inner wall of the socket 8, thereby preventing the depositing ofresidues of combustion at these points which would be liable to causeshortcircuiting of the sparking plug.

Upon the now following compression cot stroke the operation is repeatedinthe same manner.

The distance of the raised electrode 10L from the lower stationaryelectrode 9a may be adjusted in a. very simple manner by rotating thetube 11 inwards or outwards by means of a screw driver. This distance ispreferably made equal to the distance between the upper ends of thetwotubes 11 and 12, so that the length `of the sparking gap may be seenfrom the outside.

For the cleaning ot the sparker it is, for instance, suilicicnt, withoutremoving the same from the body ot the motor cylinder to merely pourbenzene or the like into the upper funnelof the tube 11. The spari-kingplug may also be detached and taken apart in a very simple manner sothat any portions whicli have become unfit for use, may be easilyexchanged.

Among the many advantages ot' a spark plug according to this inventionsome of the most important are the automatic and permanent cleaning ofthe electrodes and of the lower portion ot the inner wall of theinsulating body, the possibility of adjusting the length of the sparkgap from the outside, the very convenient fastening of the insulatingsockets, the possibility ot exchanging the several constituent parts andeasily cleaning the same. Various changes and modifications both in theconstruction as well as in the arrangement of parts will suggestthemselves to the expert, so as to adapt the device to varyingconditions of application, and l wishV it to be understood that myinvention is not restricted to the particular form of constructionherein shown and described by way of example, except as specified in theclaims, hereunto appended.

I claim:

1. Electric sparking plug comprising a metal shell, an electrode fixedin the lower end of said shell, an outer metal tube axially disposed insaid shell and insulated against it,an inner -metaltube within and incontact with said outer metal tube and an axially movable electrodeintermediate the lower end of said inner tube and said iixed electrode,a short non-cylindrical shaft on said movable electrode extending intothe lower end of said inner tube, a valve body on said movable electrodeadjoining' said shaft and adapted to close the lower end of said innertube and an insulating sleeve i `flower end of said inner tube, a valvebody on said movab-le electrode adjoining said shaft and adapted toclose the lower end of said inner tube, an insulating sleeve surroundingsaid movable electrode and a plateshaped enlargement on said movableelectrode adjoining said valve body.

3. Electric sparking plug comprising a metal shell, a sphericalelectrode iixed in the lower end of said shell, an outer metal tubeaxially disposed in said shell and insulated against it, an inner metaltube within and in contact with said outer metal tube and an axiallymovable electrode intermediate the lower end of said inner tube and saidiixed electrode, a short non-cylindricalshaft on said movable electrodeextending into the lower end ot said inner tube, a valve body on saidmovable electrode adjoining said shaft and adapted to close the lowerend of said inner tube and an insulating sleeve surrounding said movableelectrode.

in testlmony whereof I aix my signature.

LUDOMIR KGRCZYNSKL

